2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/211079We discuss the values of resonance peaks of the cross-section of a heavy quark bound state obtained by means of a Green function method applied to a Coulombic model and compare the result to the Upsilon and J/psi data.8 pages, latex2e. Accepted for publication in EPJC. Revised version has an added paragraph about J/psiHigh Energy Physics - Phenomenologytext